Interpolated and extrapolated species accumulation curves versus sample coverage (percent of the population represented by species in the sample) for the Machay and Naturetrek-Vizcaya Reserves. The black vertical line marks the number of individuals at which the richness of each are compared on each curve (this is the coverage of the least complete sample). At this coverage, the sample from Naturetrek-Viscaya would on the average have three species, while a sample of the same coverage from Machay would be expected to have six species.